Charmonium spectral functions from 2+1 flavour lattice QCD

Borsányi, Szabolcs and Durr, Stephan and Fodor, Zoltán and Hoelbling, Christian and Katz, Sándor and Stefan, Krieg and Simon, Mages and Nógrádi, Dániel and Pásztor, Attila and Andreas, Schafer and Kalman, K. Szabo and Balint, C. Toth and Trombitás, Norbert (2014) Charmonium spectral functions from 2+1 flavour lattice QCD. JOURNAL OF HIGH ENERGY PHYSICS, 2014 (4). ISSN 1126-6708

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Abstract

Finite temperature charmonium spectral functions in the pseudoscalar and vector channels are studied in lattice QCD with 2+1 flavours of dynamical Wilson quarks, on fine isotropic lattices (with a lattice spacing of 0.057fm), with a non-physical pion mass of mπ ≈ 545MeV. The highest temperature studied is approximately 1.4Tc. Up to this temperature no significant variation of the spectral function is seen in the pseudoscalar channel. The vector channel shows some temperature dependence, which seems to be con- sistent with a temperature dependent low frequency peak related to heavy quark transport, plus a temperature independent term at ω > 0. These results are in accord with previous calculations using the quenched approximation.

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